Ageratum


Ageratum

Taxobox
name = "Ageratum"


image_width = 200px
image_caption = Tropical Whiteweed ("Ageratum conyzoides")
regnum = Plantae
divisio = Magnoliophyta
classis = Magnoliopsida
ordo = Asterales
familia = Asteraceae
tribus = Eupatorieae
genus = "Ageratum"
subdivision_ranks = Species
subdivision = "many, see text"

"Ageratum" ("A-gé-ra-tum"), known as Whiteweed is a genus of 40 [cite web | url = http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=100805 | title = Ageratum | work = Flora of North America ] to 60 tropical American herbs, annuals and perennials from the Sunflower family Asteraceae, tribe Eupatorieae.

They form tussocks or small hills. They grow to a height of 75 cm. The opposite leaves are cordate or oval, hairy or tomentose. The margins are slightly toothed or serrate. The leaves form compact clusters.

The fluffy flowers are lavender-blue, pink, lilac, or white; and spread in small compound umbels.

They give small, dry fruits.

Ageratums as garden plants

They are grown for their flowers, especially the Flossflower ("Ageratum houstonianum"). Many are useful for bedding and bordering or in rock gardens.

Most common ageratums, "Hawaii" for example, are a short 6-8 inches when full grown. Tall ageratum are also available in seed catalogues, but rarely in retail stores. They are about 18 inches in height with blue flowers. There is also a medium height snowcapped variety, white top on blue flowers. The blues are most popular and common, but colors also include violet, pink and white. Their size and color makes Ageratum good candidates for rock gardens, flower beds, and containers.

"Ageratum" grow well in the sun or partial shade, from early summer to first frost. They are quite easy to grow, producing a profusion of fluffy flowers all season long. They are excellent for beginner gardeners.

Species

*"Ageratum arsenei"
*"Ageratum candidum"
*"Ageratum chortianum"
*"Ageratum connatifolius"
*"Ageratum conyzoides": Billy-Goatweed, Tropical Whiteweed, Mexican Ageratum
*"Ageratum corymbosum": Flattop Whiteweed, Butterfly Mist
**"Ageratum corymbosum" f. "album"
**"Ageratum corymbosum" f. "euryphyllum"
**"Ageratum corymbosum" var. "jaliscense"
**"Ageratum corymbosum" f. "lactiflorum"
**"Ageratum corymbosum" var. "longipetiolatum"
**"Ageratum corymbosum" var. "subsetiferum"
*"Ageratum elassocarpum"
*"Ageratum ellepticum"
*"Ageratum gaumeri"
*"Ageratum guatemalense"
*"Ageratum heterolepis"
*"Ageratum hondurense"
*"Ageratum houstonianum" : Bluemink, Flossflower, Garden Ageratum, Blueweed).
**"Ageratum houstonianum" var. "angustatum"
**"Ageratum houstonianum" f. "isochroum"
**"Ageratum houstonianum" f. "luteum"
**"Ageratum houstonianum" var. "muticescens"
**"Ageratum houstonianum" f. "niveum"
**"Ageratum houstonianum" f. "normale"
**"Ageratum houstonianum" var. "typicum"
**"Ageratum houstonianum" f. "versicolor"
*"Ageratum iltisii"
**"Ageratum latifolium" var. "galapageium"
*"Ageratum littorale" : Cape Sable Whiteweed
**"Ageratum littorale" f. "album"
**"Ageratum littorale" var. "hondurense"
**"Ageratum littorale" f. "setigerum"
*"Ageratum lucidum"
*"Ageratum lundellii"
*"Ageratum maritimum"
**"Ageratum maritimum" f. "calvum"
*"Ageratum meridensis"
**"Ageratum mexicanum" var. "majus"
*"Ageratum molinae"
*"Ageratum munaense"
*"Ageratum nelsonii"
*"Ageratum oliveri"
*"Ageratum peckii"
*"Ageratum perplexans"
*"Ageratum platypodum"
*"Ageratum radicans"
*"Ageratum reedii"
*"Ageratum rhytidophyllum"
*"Ageratum riparium"
*"Ageratum rugosum"
*"Ageratum serratum"
*"Ageratum sordidum"
*"Ageratum stachyofolium"
*"Ageratum standleyi"
*"Ageratum tehuacanum"
*"Ageratum tomentosum"
*"Ageratum viscosum"
*"Ageratum wendlandii"
*"Ageratum wrightii"

References


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Look at other dictionaries:

  • Ageratum — Ageratum …   Wikipédia en Français

  • ageratum — [ aʒeratɔm ] n. m. • 1751; lat. d o. gr. ageraton ♦ Petite plante buissonnante ornementale (composées), à fleurs bleues. Une bordure d ageratums. ● ageratum ou agérate nom masculin (latin ageraton, du grec agêraton, impérissable) Herbe (composée) …   Encyclopédie Universelle

  • Ageratum — A*ger a*tum ([.a]*j[e^]r [.a]*t[u^]m or [a^]j [ e]r*[=a] t[u^]m), prop. n. [NL., fr. Gr. agh raton a sort of plant; a priv. + gh ras old age.] (Bot.) A genus of plants, one species of which ({Ageratum Mexicanum}) has lavender blue flowers in… …   The Collaborative International Dictionary of English

  • ageratum — [aj΄ər āt′əm] n. [ModL < Gr agēraton, a kind of plant < agēratos, not growing old < a , not + gēras, old age] any of several plants (genus Ageratum) of the composite family with small, thick heads of usually bluish flowers: widely used… …   English World dictionary

  • Ageratum — (A. L.), Pflanzengattung aus der Familie der Syngenesisten, Compositae Eupatoriaceae Agerateae, Syngenesia aequalis L.; Art: A. conyzoides, mit blauen, büschelständigen Blättern, aus Amerika …   Pierer's Universal-Lexikon

  • Agerātum — L., Gattung der Kompositen, Kräuter oder Sträucher mit ebensträußigen lockern oder dichten Blütenrispen, in Brasilien, Mittel und Nordamerika. A. conyzoides L., in den wärmern Gegenden der ganzen Welt, einjährig, mit blauen Blüten, wird wie die… …   Meyers Großes Konversations-Lexikon

  • Ageratum — Agerātum L., Pflanzengattg. der Kompositen (Amerika). A. conyzoīdes L. mit zierlichen blauen oder graublauen Blüten in Doldentrauben …   Kleines Konversations-Lexikon

  • Ageratum —   Ageratum …   Wikipedia Español

  • Ageratum — Ageratum …   Wikipédia en Français

  • ageratum — /aj euh ray teuhm, euh jer euh /, n. 1. any of several composite plants of the genus Ageratum, esp. A. houstonianum, having heart shaped leaves and small, dense, blue, lavender, or white flower heads, often grown in gardens. 2. any of various… …   Universalium